Paranoid Personality Disorder is a mental health condition characterized by persistent and unfounded suspicion and mistrust of others. Some synonyms for this term include delusional disorder, suspiciousness, and paranoia. Delusional disorder refers to having a fixed, false belief that persists despite evidence to the contrary. Suspiciousness suggests a heightened sense of concern or caution about the intentions of others. Paranoia suggests a deep-seated fear or apprehension that others are trying to harm or deceive. While these terms are related, each has its particular nuance and emphasis, and can help to more fully understand the complex and challenging experiences of individuals with Paranoid Personality Disorder.